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/**
*
*/
package org.junit.experimental.theories;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
import org.junit.Assert;
import org.junit.experimental.theories.PotentialAssignment.CouldNotGenerateValueException;
import org.junit.experimental.theories.internal.Assignments;
import org.junit.experimental.theories.internal.ParameterizedAssertionError;
import org.junit.internal.AssumptionViolatedException;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.Statement;
import org.junit.runners.model.TestClass;
public class Theories extends BlockJUnit4ClassRunner {
public Theories(Class<?> klass) throws InitializationError {
super(klass);
}
@Override
protected void collectInitializationErrors(List<Throwable> errors) {
super.collectInitializationErrors(errors);
validateDataPointFields(errors);
}
private void validateDataPointFields(List<Throwable> errors) {
Field[] fields= getTestClass().getJavaClass().getDeclaredFields();
for (Field each : fields)
if (each.getAnnotation(DataPoint.class) != null && !Modifier.isStatic(each.getModifiers()))
errors.add(new Error("DataPoint field " + each.getName() + " must be static"));
}
@Override
protected void validateConstructor(List<Throwable> errors) {
validateOnlyOneConstructor(errors);
}
@Override
protected void validateTestMethods(List<Throwable> errors) {
for (FrameworkMethod each : computeTestMethods())
if(each.getAnnotation(Theory.class) != null)
each.validatePublicVoid(false, errors);
else
each.validatePublicVoidNoArg(false, errors);
}
@Override
protected List<FrameworkMethod> computeTestMethods() {
List<FrameworkMethod> testMethods= super.computeTestMethods();
List<FrameworkMethod> theoryMethods= getTestClass().getAnnotatedMethods(Theory.class);
testMethods.removeAll(theoryMethods);
testMethods.addAll(theoryMethods);
return testMethods;
}
@Override
public Statement methodBlock(final FrameworkMethod method) {
return new TheoryAnchor(method, getTestClass());
}
public static class TheoryAnchor extends Statement {
private int successes= 0;
private FrameworkMethod fTestMethod;
private TestClass fTestClass;
private List<AssumptionViolatedException> fInvalidParameters= new ArrayList<AssumptionViolatedException>();
public TheoryAnchor(FrameworkMethod method, TestClass testClass) {
fTestMethod= method;
fTestClass= testClass;
}
private TestClass getTestClass() {
return fTestClass;
}
@Override
public void evaluate() throws Throwable {
runWithAssignment(Assignments.allUnassigned(
fTestMethod.getMethod(), getTestClass()));
if (successes == 0)
Assert
.fail("Never found parameters that satisfied method assumptions. Violated assumptions: "
+ fInvalidParameters);
}
protected void runWithAssignment(Assignments parameterAssignment)
throws Throwable {
if (!parameterAssignment.isComplete()) {
runWithIncompleteAssignment(parameterAssignment);
} else {
runWithCompleteAssignment(parameterAssignment);
}
}
protected void runWithIncompleteAssignment(Assignments incomplete)
throws InstantiationException, IllegalAccessException,
Throwable {
for (PotentialAssignment source : incomplete
.potentialsForNextUnassigned()) {
runWithAssignment(incomplete.assignNext(source));
}
}
protected void runWithCompleteAssignment(final Assignments complete)
throws InstantiationException, IllegalAccessException,
InvocationTargetException, NoSuchMethodException, Throwable {
new BlockJUnit4ClassRunner(getTestClass().getJavaClass()) {
@Override
protected void collectInitializationErrors(
List<Throwable> errors) {
// do nothing
}
@Override
public Statement methodBlock(FrameworkMethod method) {
final Statement statement= super.methodBlock(method);
return new Statement() {
@Override
public void evaluate() throws Throwable {
try {
statement.evaluate();
handleDataPointSuccess();
} catch (AssumptionViolatedException e) {
handleAssumptionViolation(e);
} catch (Throwable e) {
reportParameterizedError(e, complete
.getArgumentStrings(nullsOk()));
}
}
};
}
@Override
protected Statement methodInvoker(FrameworkMethod method, Object test) {
return methodCompletesWithParameters(method, complete, test);
}
@Override
public Object createTest() throws Exception {
return getTestClass().getOnlyConstructor().newInstance(
complete.getConstructorArguments(nullsOk()));
}
}.methodBlock(fTestMethod).evaluate();
}
private Statement methodCompletesWithParameters(
final FrameworkMethod method, final Assignments complete, final Object freshInstance) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
try {
final Object[] values= complete.getMethodArguments(
nullsOk());
method.invokeExplosively(freshInstance, values);
} catch (CouldNotGenerateValueException e) {
// ignore
}
}
};
}
protected void handleAssumptionViolation(AssumptionViolatedException e) {
fInvalidParameters.add(e);
}
protected void reportParameterizedError(Throwable e, Object... params)
throws Throwable {
if (params.length == 0)
throw e;
throw new ParameterizedAssertionError(e, fTestMethod.getName(),
params);
}
private boolean nullsOk() {
Theory annotation= fTestMethod.getMethod().getAnnotation(
Theory.class);
if (annotation == null)
return false;
return annotation.nullsAccepted();
}
protected void handleDataPointSuccess() {
successes++;
}
}
}
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